To drive out the chips

To reduce the weight

To reduce the cost

To increase the speed

75 Degree

80 Degree

90 Degree

120 Degree

D = d ? p/10

D = d + p/10

D = d x p/10

D = d ? p/10

Acme thread

Square thread

Knuckle thread

Trapezoidal thread

Bond

Abrasive

Structure

Grain size